Drilling machine fob



J. E. JUDY., Y DRILLING MACHINE FOR TAPPING OUT THE HOT METAL 0F FURNACES AND CUPOLAS.

. APPLICATION FILED APR. 8, 1921- 1,424,483. Patented Aug. 1, 1922.

I 3mm war/ H E. J/DY,

JOSEPH E. JUDY, OF MCKEESPOBT', PENNSYLVANIA.

. DRILLING- MACI-IINE FOR TAPIPING- OUT.THE HOT METAL OF FURNACESi AND CUPOLAS.

' Application filed April 8,

To all whom it may concern Be it known that I, JosnPH E. JUDY, a

v citizen of the United States, residing at Moscription which follows.

Keesport, in the county of Allegheny and State of Pennsylvania, have invented cer-. tain new and useful Improvements in Drilling Machines for Tapping Out the Hot Metal of Furnaces and Cupolas, of which the following is a specification, reference be ing had therein to the accompanying draw- This invention relates to drilling machines for tapping out the hot metal of furnaces and cupolas to permit the hot metal to run into the pots or ladles.

The invention contemplates the provision of a drilling machine adapted to be operated by fluid pressure and to be suspended from a jib crane or other movable supporting element and swung into position in front of the tapping hole and held there during the drilling of the hole. v I I A further object of the invention is the provision of means to blow the dust out of the hole as fast as it is bored or drilled.

Further objects and advantages of the invention will be set forth in the detailed de- In' the accompanying drawing: I

Fig. 1 is a view partly in side elevation and partlyin longitudinal section of a drilling machine constructed in accordance with the invention; and

Fig. 2 is a transverse sectional view upon line 2-2 of Fig. l illustrating' an angular rotary shaft and a tubular piston rod, hereinafter described.

Referring to the drawing 5 designates a cylinder, the ends of which areclosed by heads 6 and 7. A stuffing box 8 in the head 6 provides means for maintaining a fluid tight joint about a shaft 9 which at that point is round'in cross section. A. stufling boX 10 carried by the head 7 provides means for maintaining a tight joint about a tubuthrough a pipe 16 and port 16 and estabthe pistonyto the other.

Specification of Letters Patent. 'Pgfggnted Aug, 1, 15 322;

1921. Serial no. 45 ,623.

lishing communication between the other end of the cylinder and an exhaust pipe 17. throughpipe18; and when in another positionyadmitting the pressure fluid to the last named end of the cylinder through pipe 18 and connecting the other endv of the cylinder with the exhaust pipe 17 as will be readily understOodJThe piston 12 is mounted upon a spool 19; said spool being capable ofrotation with respect to the piston. This spool comprises a shoulder 20, a threaded extension 21 and a threaded end 22. Bearing plates 23 and 24 constitute ball race-s which receiveball-bearin'gs 25 between them. A corresponding antifriction' bearing is disposed upon the opposite side of the piston and comprises the bearing plates 27 and28 and balls 29. All of these parts are held in assembled relation upon the spool by means of a retaining nut 30. Packing 31 of'aiiy suitable nature is disposed between the piston and the periphery of the spool and prevents the pressure fluid within the cylinder from passing from one side of The extension 21 of the spool is connected by a sleeve or coupling 32 with 'the hollow piston rod 11 and this hollow piston rod is provided exteriorly of the cylinder-with a coupling or block 33 in which a drill 34 is held by a set screw or like fastening device 35. The drill is pointed at 36 and in addition is provided with a flaring counter-sinking cutter 37 which traverses the drill and is held therein by a set screw 38; An'air or'steam pipe 39 terminates rearwardly of the cutter 37 and receives its supply of pressure fluid'from the hollow piston rod through a bore 39 The hollow piston rod in turn receives this pres-' sure fluid from a port 40 which is formed longitudinally through the spool and the rear end of which is incommunication with port 16. The shaft 41 of a motor 42is connected by a coupling sleeve 43 with the end of the shaft 9 through the medium of keys 44 and pin 45. Thus the shaft 9 is caused to rotate with the shaft 41 of the motor. The sleeve 43 lies upon one side of a bearing plate 45 that is supported upon the bed plate 46 and a collar 47 secured to the shaft Qby a set screw 48 bears upon the-opposite side of this plate. the whole constituting a thrust bearing to present endwise movement of the shaft 9.

Thus it will be understood that the shaft m 1*: -W -M 9 rotates but does not reciprocate. lhe hollow piston rod 11 rotates and reciprocates, while the piston 12 reciprocates but does not rotate; As beforestatedythat portion of the shaft 9 which passes through the stuffing-box vice is swung around in front of the tapping hole and compressed air is then admitted to the rear end of the cylinder in the manner described. This forces the piston 12 forward'ly inthe cylinder and brings the point of thedrill intocontact with the plug hole that is to b opened. The motor 4:2 is then Started and rotation is imparted to'the drill through shaft'9 spool 19, hollow piston rod 1 and bloc Pressure i mainta ned the re r of h pis on du ing h d illing operation to force the drill forwardly and some of the pressure fluid finds its way through pipe '39 and blows the dust away as fast as the hole is drilled' Thus the hole is drilled {and kept clean in one operation. The instan thatthe drill goes th ough t e plug that is to be removed from the tapping hole, the four way valve is turned to'the other position and pressure is admitted in fr nt of the piston to'fore the dril'l'and piston 'back to the starting point. l/Vhen this isdone the d illing m chine, by means of t e c ane is s ung b ar of he pouring trough and the hot metal is permitted to pour o t n o he .po o ladies.

' Having described my invention what I claim and desire to secure by Letters Pat ent is;

device o he character descr be comprising as a bodily ,portableunit, a base, a pressure cylinder mounted upon saidbase, a piston in said "cylinder, a piston rod mcuntedto rotate with respect to thepiston, an electric motor upon the base outside of the cylinder and serving to impart rotation to the piston rod, a drill carried by the piston rod,-means for admitting pressure fluid to thecylinder to actuatejthe piston and the plston rod to advance and retract the drill and a suspension-elementthrough which the entire unit may be suspended in such manher as to'support the drill in a substantially horizontal position while said unit iszbeing swinging movement to and from the ing [hole of a furnace, of a horizontally cisposed frame, a horizontally disposed" pressure cylinderfon theframe, an electricmotor coaxial with said cy1inder,.a shaft connected to said motor and rotated by said motor, a spool slidably mounteduponrnangular portion of the shaft, a piston mounted i to rotate with respect to said spool, afhollow piston rod connected to said spool and a drill carried Ibysaid hollow piston rod.

A device vof the character described comprising v a supporting base, a motor mounted thereon, a pressure cylinder mount ed thereon, a shaft projecting into the pressure cylinder and having an angular portion rtherein,means for connecting said shaft to the shaft of the motor, a thrust bearing resisting endwise movement of said shaft, a spool within the cylinder slidably mounted upon the angular portion of the shaft, said spool having an air port formed therethrough, a hollow piston rod connected to said spool, said port communicating with the interiorzof said hollow piston rod, antifriction bearings upon theyperipheryof the spool, a piston carried by .the

1 spool and disposed between saidanti'friction bearings, guiding elements carried by the angular portions of the i shaft and bearing against the inner periphery of the'ho'llow piston rod, a drill, a coupling between'said drill and the hollow piston rod, an air blast pipe and means establishing communication between the air blast pipe and the interior of the hollow piston rod.

In testimony whereof I signature. 1

JOSEPH. E; JUDYQ hereunto aiiijx my 

